Isn't the ability to shoot someone dead, "the ability to restrict other's movements"?

This is entirely dependent on how the firearm is used. I have carried one (or more) for several decades, and I have not restricted anyone. Most firearms in good people's hands are defensive in nature too. ANY TOOL can be used improperly, but more firearms Historically reduces crime numbers.

In your wild-west-fantasy, how do you expect people to keep others from doing "harm to others with their property"?

This is not something I like, and I wish it was not needed! If used properly, for self defense, no one outside of those initiating harm, will suffer. A hundred firearms in my neighborhood would cause me no problems.

Conversely, ONE Offensive firearm could cause irreparable harm, in the absence of defensive firearms.

My firearm is a precision device, because I Practice, but your stop dead app would damage all cars in it's path. One bullet from my hunting rifle would permanently stop a car if I needed to do so. Besides the equipment required is significant, and can never be contained in a cell phone.

Isn't the concept of "guns for everyone" (mutually assured destruction) precisely the same as giving everyone equal access to the hypothetical StopDead app?

Guns for everyone is guaranteed in our founding documents, to avoid the real threat, democide

https://en.wikipedia.org/wiki/Democide THIS killed more people in the last century than all the wars did, so this is the real threat!

There is a real possibility that were this car killing ability become popular, there is a very good chance that the attacker would destroy his own car at the same time. I could modify my car to resist a specific Frequency, both on the transmit and receive ends. The rifle would be more positive , LOL!

Your video is interesting, I am currently preparing a home in the country I already bought, to be off grid and self contained. I will make my own power, vehicle fuel, and food....

:)>